11const { MongoClient } = require ( 'mongodb' ) ;
22
3- // CRUD operations in transactions must be on existing collections, so be sure you have run
4- // usersCollection.js prior to running this script.
3+ // In MongoDB 4.2 and earlier, CRUD operations in transactions must be on existing collections
4+ // See https://docs.mongodb.com/manual/core/transactions/#transactions-api for more information
5+ // Be sure you have run usersCollection.js prior to running this script
56
67async function main ( ) {
78 /**
@@ -64,10 +65,10 @@ async function createReservation(client, userEmail, nameOfListing, reservationDa
6465 const reservation = createReservationDocument ( nameOfListing , reservationDates , reservationDetails ) ;
6566
6667 // Step 1: Start a Client Session
67- // See http ://bit.ly/Node_startSession for the startSession() docs
68+ // See https ://mongodb.github.io/node-mongodb-native/3.6/api/MongoClient.html#startSession for the startSession() docs
6869 const session = client . startSession ( ) ;
6970
70- // Step 2: Optional. Define options to use for the transaction
71+ // Step 2: Optional. Define options for the transaction
7172 const transactionOptions = {
7273 readPreference : 'primary' ,
7374 readConcern : { level : 'local' } ,
@@ -77,7 +78,7 @@ async function createReservation(client, userEmail, nameOfListing, reservationDa
7778 try {
7879 // Step 3: Use withTransaction to start a transaction, execute the callback, and commit (or abort on error)
7980 // Note: The callback for withTransaction MUST be async and/or return a Promise.
80- // See http ://bit.ly/Node_withTransaction for the withTransaction() docs
81+ // See https ://mongodb.github.io/node-mongodb-native/3.6/api/ClientSession.html#withTransaction for the withTransaction() docs
8182 const transactionResults = await session . withTransaction ( async ( ) => {
8283
8384 // Important:: You must pass the session to each of the operations
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